Jammed Ortlieb bracket

[ceepeebee]

Hi all, am hoping someone else has had the same problem - just fitted my old Ortleib waterproof saddlebag to my new Kaffenback, all very well til I Klick to fit and the click seems rather .....clunky. Of course now the blooming thing is jammed and I can't get the bag off the bracket. Even with the seatpost out of the frame I can't work out how to free the sod. Of course, it's good and secure, so I can ride with it, but of course it's not like I can take it off for security.

Little help anyone?